I remember when milling hold down holes for my waste board, the direction of cutting made a big difference in the roundness and size. My bit was bending much more depending when I climbed or conventional cut - AKA clockwise or counter inside of MakerCAM.
Or was I imagining things due to being a complete newbie at the time?

McOtis wrote:I remember when milling hold down holes for my waste board, the direction of cutting made a big difference in the roundness and size. My bit was bending much more depending when I climbed or conventional cut - AKA clockwise or counter inside of MakerCAM.
Or was I imagining things due to being a complete newbie at the time?

You were not imagining anything. Unless your machine is very rigid (the ShapeOko is not) you should always do conventional cutting.

3. Just before i went home from the workshop, i did a last try to locate the problem,
It tried to push the bit to the sides instead of back and forth (don't know why i didn't do that before).
I could see, the deflection on the sides to be worse.

IMG_3368pil.jpg (409.22 KiB) Viewed 1097 times

I just ordered some extra V-wheel, to add on the Z-axis and see if it helps